Thiazolemethine dyes

Abstract

Methine dyes of the formula I ##STR1## where R is hydrogen, unsubstituted or substituted C 1 -C 10 -alkyl or unsubstituted or substituted phenyl, X is nitrogen or a radical of the formula CQ 1 , CH═CQ 1 --CH, CH═CH--CH═CH--CH, ##STR2## where Q 1 is hydrogen, C 1 -C 4 -alkyl, chlorine or bromine and Q 2 is hydrogen or C 1 -C 4 -alkyl, and Y is a radical of the aniline, aminonaphthalene, indole, aminoquinoline, aminothiazole or aminothiophene series, the use thereof in nonlinear optics, and novel thiazole derivatives.

We claim: 
     
       1. A methine dye of the formula I ##STR44## where R is ##STR45## where W is hydrogen, C 1  -C 6  -alkanoyl, acryloyl or methacryloyl, X is a radical of the formula CQ 1 , CH═CQ 1  --CH, CH═CH--CH═CH--CH, ##STR46## where Q 1  is hydrogen, C 1  -C 4  -alkyl, chlorine or bromine and Q 2  is hydrogen or C 1  -C 4  -alkyl, and Y is a a dye-imparting group containing a moiety selected from the group consisting of aniline, aminonaphthalene, indole, aminoquinoline and aminothiophene.   
     
     
       2. A methine dye as claimed in claim 1, wherein the moiety in Y is aniline, aminonaphthalene or aminoquinoline. 
     
     
       3. A methine dye as claimed in claim 1, wherein X is a radical of the formula CH, CH═CH--CH or CH═CH--CH═CH--CH. 
     
     
       4. A methine dye as claimed in claim 1, wherein the moiety in Y is aniline. 
     
     
       5. A thiazole derivative of the formula IVa ##STR47## where W is hydrogen, C 1  -C 6  -alkanoyl, acryloyl or methacryloyl. 
     
     
       6. A process for dyeing a substrate comprising applying the methine dye of claim 1 to said substrate to effect dyeing thereof.